Generic wrapper for System.Web.Caching.Cache functions
- by David Neale
I've created a generic wrapper for using the Cache object:
public class Cache<T> where T : class
{
public Cache Cache {get;set;}
public CachedKeys Key {get;set;}
public Cache(Cache cache, CachedKeys key){
Cache = cache;
Key = key;
}
public void AddToCache(T obj){
Cache.Add(Key.ToString(),
obj,
null,
DateTime.Now.AddMinutes(5),
System.Web.Caching.Cache.NoSlidingExpiration,
System.Web.Caching.CacheItemPriority.Normal,
null);
}
public bool TryGetFromCache(out T cachedData) {
cachedData = Cache[Key.ToString()] as T;
return cachedData != null;
}
public void RemoveFromCache() {
Cache.Remove(Key.ToString()); }
}
The CachedKeys enumeration is just a list of keys that can be used to cache data.
The trouble is, to call it is quite convuluted:
var cache = new Cache<MyObject>(Page.Cache, CachedKeys.MyKey);
MyObject myObject = null;
if(!cache.TryGetFromCache(out myObject)){
//get data...
cache.AddToCache(data); //add to cache
return data;
}
return myObject;
I only store one instance of each of my objects in the cache.
Therefore, is there any way that I can create an extension method that accepts the type of object to Cache and uses (via Reflection) its Name as the cache key?
public static Cache<T> GetCache(this Cache cache, Type cacheType){
Cache<cacheType> Cache = new Cache<cacheType>(cache, cacheType.Name);
}
Of course, there's two errors here:
Extension methods must be defined in a non-generic static class
The type or namespace name 'cacheType' could not be found
This is clearly not the right approach but I thought I'd show my working. Could somebody guide me in the right direction?
